Kawasaki Ko to Onomichi-Itozaki — sea route & marine weather
The sea route from Kawasaki Ko (JPKWS) to Onomichi-Itozaki (JPONX) is about 976 nm — about 4 days at 10 kn. Along the route today (Nov 2): N wind 3–19 kn, waves 0.4–2.4 m. The baseline track is drawn on the chart; Calculate replans it for your vessel and live weather.
Passage facts| Sea-route distance | 976 nm |
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| Passage time at 10 kn | about 4 days |
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| Great-circle distance | 332 nm |
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| Kawasaki Ko | 35°30.0′N 139°46.0′E |
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| Onomichi-Itozaki | 34°23.0′N 133°10.0′E |
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| Reference vessel | 4.5 m draft, 10 kn cruise |
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10-day marine forecast — along the route
| Date | Wind | Gusts | Waves |
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| N 3–19 kn | 18 kn | 0.4–2.4 m |
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| NNE 3–23 kn | 24 kn | 0.3–2.4 m |
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| E 2–27 kn | 33 kn | 0.4–4.2 m |
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| WNW 4–28 kn | 36 kn | 0.4–4.4 m |
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| NW 8–39 kn | 43 kn | 0.5–3.5 m |
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| NNE 3–21 kn | 20 kn | 0.4–3.1 m |
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| NNW 2–20 kn | 18 kn | 0.2–2.0 m |
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| NNW 8–23 kn | 23 kn | 0.3–2.3 m |
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| N 2–14 kn | 14 kn | 0.5–2.7 m |
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| NE 3–13 kn | 14 kn | 0.4–3.0 m |
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Forecast from the NOAA GFS model run , waves from ECMWF WAM. Updated with each model cycle; the live chart below recalculates for your departure time and vessel.
Frequently asked
How far is it from Kawasaki Ko to Onomichi-Itozaki by sea?
The water route is 976 nm (1,808 km), computed on WXMarine's maritime routing network. The same distance applies on the return passage from Onomichi-Itozaki to Kawasaki Ko.
How long does the passage from Kawasaki Ko to Onomichi-Itozaki take?
about 4 days at a 10 kn cruise. Scale by your own speed: at half the speed it takes about twice as long. The planner on this page recalculates for your vessel and live weather.
What is the weather between Kawasaki Ko and Onomichi-Itozaki today?
Along the route today, per the NOAA GFS run 2026-11-02 18z: N wind 3–19 kn, waves 0.4–2.4 m. The day-by-day table on this page covers the next 10 days.